public class  TwoTuple<A,B>
{
	public final A first;
	public final B second;
	public TwoTuple(A a, B b) { first = a; second = b; }
	public String toString() 
	{
		return " ( " + first + " , " + second + " ) ";
	}
	public static void main(String[] args) 
	{
		TwoTuple<String,String> s = new TwoTuple<String,String>("aa","bb");
		System.out.println(s.toString());
	}
}
